I know by default numpad 0 will execute a hit. So, it should be: key for Yield+,Numpad 0,Yield+,Numpad 0,Yield+,Numpad 0,Yield+,Numpad 0
Or however many times you want to make it hit it. But, it will get caught on +1/2 extra nodes. You could just make a simple rotation:
Start
x1 Yield +1
Hit Once
x1 Yield +1
Hit Once
x1 Yield +1
Hit Once
x1 Yield +1
Hit Once
This will do it 4 times if there is enough GP and then continue to gather at the node to deplete it.
Hope this helps. I am still learning as well.